I'm planning to start my own comic business with original characters.

So I'm just wondering what I need be prepared for when it comes to character names, I'm not using obvious big ones owned by DC, Marvel, or other publishers, but I'm sure a couple names I use have been used as small throwaway names over the last 80 years.

Do I really need to tweak every name that's been used by one of those publishers? If I'm hoping this get some traction (as unlikely as that is) I don't want to get shut down because the "Barracuda," was used in 1955 during a single issue and never really thought of again, for example. I'm completely clueless when it comes to this stuff so maybe I'm thinking of problems I shouldn't worry about, just want to be sure before I sit down and officially script it out.

I'm sure I can find this info online but I figure a real person giving a brief explanation would be way more helpful, anyway, thanks!